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This article is about how to analyze the JDK 6 Java Console class function overview, the editor thinks it is very practical, so share it with you to learn, hope you can get something after reading this article, say no more, follow the editor to have a look.

The java.io.Console class is provided in JDK 6 to access character-based console devices. If your Java program wants to interact with cmd under Windows or Terminal under Linux, you can use this Java Console class instead.

TestConsole.java Code:

Package com.simon.testjdk6.console; import java.io.Console; public class TestConsole {/ * * @ param args * / public static void main (String [] args) {Console console = System.console () / / obtain the Console instance object if (console! = null) {/ / determine whether the console has the right to use String user = new String ("Enter username:"); / / read the entire line of characters String pwd = new String ("Enter passowrd:")) / / read the password without displaying console.printf ("Username is:" + user + "\ n"); / / displaying the user name console.printf ("Password is:" + pwd + "\ n"); / / displaying the password} else {System.out.println ("Console is unavailable.") / / prompt no console permission}

Java does not always get available Java Console classes when it comes to interacting with Console. Whether a JVM has a Console available depends on how the underlying platform and JVM are called. If JVM is started on an interactive command line (such as Windows's cmd) and the input and output are not redirected somewhere else, then we can get an available Console instance.

When you have the above code running in Eclipse or NetBean, there will be the following text output in Console:

Console is unavailable.

Indicates that the Java program cannot get an instance of Console because the JVM is not called on the command line or the input and output are redirected.

Run the code in the console, and the effect will be as follows:

$java com.simon.testjdk6.console.TestConsole Enter user:Simon Enter passowrd: User is:Simon Password is:12345

We can see that when entering the password, the password characters we entered are not displayed in the console. But the program can get and output the password string. This is how the new Java Console class in JDK 6 works.

The above is how to analyze the overview of Java Console class functions in JDK 6. The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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